Mojo C++ bindings: remove usage of AssociatedGroup from ipc/

ipc/ipc_sync_message_filter.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_sync_message_filter.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 154 matching lines @@
   }
 
   return pending_message.send_result;
 }
 
 void SyncMessageFilter::OnFilterAdded(Channel* channel) {
   std::vector<std::unique_ptr<Message>> pending_messages;
   {
     base::AutoLock auto_lock(lock_);
     channel_ = channel;
-    Channel::AssociatedInterfaceSupport* support =
-        channel_->GetAssociatedInterfaceSupport();
-    if (support)
-      channel_associated_group_ = *support->GetAssociatedGroup();
 
     io_task_runner_ = base::ThreadTaskRunnerHandle::Get();
     shutdown_watcher_.StartWatching(
         shutdown_event_,
         base::Bind(&SyncMessageFilter::OnShutdownEventSignaled, this));
     io_message_loop_observer_->StartOnIOThread();
     std::swap(pending_messages_, pending_messages);
   }
   for (auto& msg : pending_messages)
     SendOnIOThread(msg.release());
@@ skipping 94 matching lines @@
   if (!channel_)
     return;
 
   Channel::AssociatedInterfaceSupport* support =
       channel_->GetAssociatedInterfaceSupport();
   support->GetGenericRemoteAssociatedInterface(
       interface_name, std::move(handle));
 }
 
 }  // namespace IPC